Take weight, everything frozen allready has less volume than actual liquid water. Weight pushes water down and drives it up, less ice underwater will thus de facto have less volume, so underwater melting will actually lower the sea level. Take the ice above the sea-level, how do you see that raising the sea, which is about 2/3 of the planet, with 2 meter? Not enough water.
And especially not with 70 meter. Al Gore knows that, he bought a very nice house at the coasts. Clever guy, got to give it to him.
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